| /* |
| * Battery measurement code for Zipit Z2 |
| * |
| * Copyright (C) 2009 Peter Edwards <sweetlilmre@gmail.com> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| * |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/gpio.h> |
| #include <linux/i2c.h> |
| #include <linux/interrupt.h> |
| #include <linux/irq.h> |
| #include <linux/power_supply.h> |
| #include <linux/slab.h> |
| #include <linux/z2_battery.h> |
| |
| #define Z2_DEFAULT_NAME "Z2" |
| |
| struct z2_charger { |
| struct z2_battery_info *info; |
| int bat_status; |
| struct i2c_client *client; |
| struct power_supply batt_ps; |
| struct mutex work_lock; |
| struct work_struct bat_work; |
| }; |
| |
| static unsigned long z2_read_bat(struct z2_charger *charger) |
| { |
| int data; |
| data = i2c_smbus_read_byte_data(charger->client, |
| charger->info->batt_I2C_reg); |
| if (data < 0) |
| return 0; |
| |
| return data * charger->info->batt_mult / charger->info->batt_div; |
| } |
| |
| static int z2_batt_get_property(struct power_supply *batt_ps, |
| enum power_supply_property psp, |
| union power_supply_propval *val) |
| { |
| struct z2_charger *charger = container_of(batt_ps, struct z2_charger, |
| batt_ps); |
| struct z2_battery_info *info = charger->info; |
| |
| switch (psp) { |
| case POWER_SUPPLY_PROP_STATUS: |
| val->intval = charger->bat_status; |
| break; |
| case POWER_SUPPLY_PROP_TECHNOLOGY: |
| val->intval = info->batt_tech; |
| break; |
| case POWER_SUPPLY_PROP_VOLTAGE_NOW: |
| if (info->batt_I2C_reg >= 0) |
| val->intval = z2_read_bat(charger); |
| else |
| return -EINVAL; |
| break; |
| case POWER_SUPPLY_PROP_VOLTAGE_MAX: |
| if (info->max_voltage >= 0) |
| val->intval = info->max_voltage; |
| else |
| return -EINVAL; |
| break; |
| case POWER_SUPPLY_PROP_VOLTAGE_MIN: |
| if (info->min_voltage >= 0) |
| val->intval = info->min_voltage; |
| else |
| return -EINVAL; |
| break; |
| case POWER_SUPPLY_PROP_PRESENT: |
| val->intval = 1; |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static void z2_batt_ext_power_changed(struct power_supply *batt_ps) |
| { |
| struct z2_charger *charger = container_of(batt_ps, struct z2_charger, |
| batt_ps); |
| schedule_work(&charger->bat_work); |
| } |
| |
| static void z2_batt_update(struct z2_charger *charger) |
| { |
| int old_status = charger->bat_status; |
| struct z2_battery_info *info; |
| |
| info = charger->info; |
| |
| mutex_lock(&charger->work_lock); |
| |
| charger->bat_status = (info->charge_gpio >= 0) ? |
| (gpio_get_value(info->charge_gpio) ? |
| POWER_SUPPLY_STATUS_CHARGING : |
| POWER_SUPPLY_STATUS_DISCHARGING) : |
| POWER_SUPPLY_STATUS_UNKNOWN; |
| |
| if (old_status != charger->bat_status) { |
| pr_debug("%s: %i -> %i\n", charger->batt_ps.name, old_status, |
| charger->bat_status); |
| power_supply_changed(&charger->batt_ps); |
| } |
| |
| mutex_unlock(&charger->work_lock); |
| } |
| |
| static void z2_batt_work(struct work_struct *work) |
| { |
| struct z2_charger *charger; |
| charger = container_of(work, struct z2_charger, bat_work); |
| z2_batt_update(charger); |
| } |
| |
| static irqreturn_t z2_charge_switch_irq(int irq, void *devid) |
| { |
| struct z2_charger *charger = devid; |
| schedule_work(&charger->bat_work); |
| return IRQ_HANDLED; |
| } |
| |
| static int z2_batt_ps_init(struct z2_charger *charger, int props) |
| { |
| int i = 0; |
| enum power_supply_property *prop; |
| struct z2_battery_info *info = charger->info; |
| |
| if (info->charge_gpio >= 0) |
| props++; /* POWER_SUPPLY_PROP_STATUS */ |
| if (info->batt_tech >= 0) |
| props++; /* POWER_SUPPLY_PROP_TECHNOLOGY */ |
| if (info->batt_I2C_reg >= 0) |
| props++; /* POWER_SUPPLY_PROP_VOLTAGE_NOW */ |
| if (info->max_voltage >= 0) |
| props++; /* POWER_SUPPLY_PROP_VOLTAGE_MAX */ |
| if (info->min_voltage >= 0) |
| props++; /* POWER_SUPPLY_PROP_VOLTAGE_MIN */ |
| |
| prop = kzalloc(props * sizeof(*prop), GFP_KERNEL); |
| if (!prop) |
| return -ENOMEM; |
| |
| prop[i++] = POWER_SUPPLY_PROP_PRESENT; |
| if (info->charge_gpio >= 0) |
| prop[i++] = POWER_SUPPLY_PROP_STATUS; |
| if (info->batt_tech >= 0) |
| prop[i++] = POWER_SUPPLY_PROP_TECHNOLOGY; |
| if (info->batt_I2C_reg >= 0) |
| prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_NOW; |
| if (info->max_voltage >= 0) |
| prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MAX; |
| if (info->min_voltage >= 0) |
| prop[i++] = POWER_SUPPLY_PROP_VOLTAGE_MIN; |
| |
| if (!info->batt_name) { |
| dev_info(&charger->client->dev, |
| "Please consider setting proper battery " |
| "name in platform definition file, falling " |
| "back to name \" Z2_DEFAULT_NAME \"\n"); |
| charger->batt_ps.name = Z2_DEFAULT_NAME; |
| } else |
| charger->batt_ps.name = info->batt_name; |
| |
| charger->batt_ps.properties = prop; |
| charger->batt_ps.num_properties = props; |
| charger->batt_ps.type = POWER_SUPPLY_TYPE_BATTERY; |
| charger->batt_ps.get_property = z2_batt_get_property; |
| charger->batt_ps.external_power_changed = z2_batt_ext_power_changed; |
| charger->batt_ps.use_for_apm = 1; |
| |
| return 0; |
| } |
| |
| static int z2_batt_probe(struct i2c_client *client, |
| const struct i2c_device_id *id) |
| { |
| int ret = 0; |
| int props = 1; /* POWER_SUPPLY_PROP_PRESENT */ |
| struct z2_charger *charger; |
| struct z2_battery_info *info = client->dev.platform_data; |
| |
| if (info == NULL) { |
| dev_err(&client->dev, |
| "Please set platform device platform_data" |
| " to a valid z2_battery_info pointer!\n"); |
| return -EINVAL; |
| } |
| |
| charger = kzalloc(sizeof(*charger), GFP_KERNEL); |
| if (charger == NULL) |
| return -ENOMEM; |
| |
| charger->bat_status = POWER_SUPPLY_STATUS_UNKNOWN; |
| charger->info = info; |
| charger->client = client; |
| i2c_set_clientdata(client, charger); |
| |
| mutex_init(&charger->work_lock); |
| |
| if (info->charge_gpio >= 0 && gpio_is_valid(info->charge_gpio)) { |
| ret = gpio_request(info->charge_gpio, "BATT CHRG"); |
| if (ret) |
| goto err; |
| |
| ret = gpio_direction_input(info->charge_gpio); |
| if (ret) |
| goto err2; |
| |
| irq_set_irq_type(gpio_to_irq(info->charge_gpio), |
| IRQ_TYPE_EDGE_BOTH); |
| ret = request_irq(gpio_to_irq(info->charge_gpio), |
| z2_charge_switch_irq, 0, |
| "AC Detect", charger); |
| if (ret) |
| goto err3; |
| } |
| |
| ret = z2_batt_ps_init(charger, props); |
| if (ret) |
| goto err3; |
| |
| INIT_WORK(&charger->bat_work, z2_batt_work); |
| |
| ret = power_supply_register(&client->dev, &charger->batt_ps, NULL); |
| if (ret) |
| goto err4; |
| |
| schedule_work(&charger->bat_work); |
| |
| return 0; |
| |
| err4: |
| kfree(charger->batt_ps.properties); |
| err3: |
| if (info->charge_gpio >= 0 && gpio_is_valid(info->charge_gpio)) |
| free_irq(gpio_to_irq(info->charge_gpio), charger); |
| err2: |
| if (info->charge_gpio >= 0 && gpio_is_valid(info->charge_gpio)) |
| gpio_free(info->charge_gpio); |
| err: |
| kfree(charger); |
| return ret; |
| } |
| |
| static int z2_batt_remove(struct i2c_client *client) |
| { |
| struct z2_charger *charger = i2c_get_clientdata(client); |
| struct z2_battery_info *info = charger->info; |
| |
| cancel_work_sync(&charger->bat_work); |
| power_supply_unregister(&charger->batt_ps); |
| |
| kfree(charger->batt_ps.properties); |
| if (info->charge_gpio >= 0 && gpio_is_valid(info->charge_gpio)) { |
| free_irq(gpio_to_irq(info->charge_gpio), charger); |
| gpio_free(info->charge_gpio); |
| } |
| |
| kfree(charger); |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_PM |
| static int z2_batt_suspend(struct device *dev) |
| { |
| struct i2c_client *client = to_i2c_client(dev); |
| struct z2_charger *charger = i2c_get_clientdata(client); |
| |
| flush_work(&charger->bat_work); |
| return 0; |
| } |
| |
| static int z2_batt_resume(struct device *dev) |
| { |
| struct i2c_client *client = to_i2c_client(dev); |
| struct z2_charger *charger = i2c_get_clientdata(client); |
| |
| schedule_work(&charger->bat_work); |
| return 0; |
| } |
| |
| static const struct dev_pm_ops z2_battery_pm_ops = { |
| .suspend = z2_batt_suspend, |
| .resume = z2_batt_resume, |
| }; |
| |
| #define Z2_BATTERY_PM_OPS (&z2_battery_pm_ops) |
| |
| #else |
| #define Z2_BATTERY_PM_OPS (NULL) |
| #endif |
| |
| static const struct i2c_device_id z2_batt_id[] = { |
| { "aer915", 0 }, |
| { } |
| }; |
| MODULE_DEVICE_TABLE(i2c, z2_batt_id); |
| |
| static struct i2c_driver z2_batt_driver = { |
| .driver = { |
| .name = "z2-battery", |
| .owner = THIS_MODULE, |
| .pm = Z2_BATTERY_PM_OPS |
| }, |
| .probe = z2_batt_probe, |
| .remove = z2_batt_remove, |
| .id_table = z2_batt_id, |
| }; |
| module_i2c_driver(z2_batt_driver); |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("Peter Edwards <sweetlilmre@gmail.com>"); |
| MODULE_DESCRIPTION("Zipit Z2 battery driver"); |